Face run-out gauge



Aug. 11, 1953 H. H. GATES FACE RUN-OUT GAUGE 2 Sheets-Sheet l Filed Nov.2 1949 Aug. l1, 1953 H. H. GATES FACE RUN-OUT GAUGE 2 Sheets-Sheet 2Filed Nov. 2, 1949 www if Patented Aug. 11, 1953 FACE RUN-OUT GAUGEHesslar H. Gates, Charlestown, N. H., assigner to Bryant Chuckng GrinderCompany, Springfield, Vt., a corporation of Vermont Application November2, 1949, Serial No. 125,103

5 Claims.

This invention relates to gages for testing the accuracy of a surface ofan internal or vexternally threaded or plane diameter Work piece withrelation to the axis of the diameter, and it has for an object toprovide such a gage wherein the alinement of the gaging elements isdetermined by the surface to be gaged.

A further object is to provide such a. gage wherein axial motion of theWork piece during the gaging operation has no effect on the indicatorreading and without requiring the use of any external parallel motion.

Further objects and advantages will appear from a description of certainembodiments of the invention shown in the accompanying drawings in whichFigure 1 is a top plan view of a gage for testing internally threadedwork and embodying the invention.

Figure 2 is a vertical sectional view on line 2 2 of Figure 1.

Figure 3 is a detail sectional view on line 3 3 of Figure 2.

Figure 4 is a view similar to a portion of Figure 2, but showing a gagefor testing externally threaded work and arranged to gage an under faceof the work.

Figure 5 is a side elevation of the gage shown in Figures 1 to 3,inclusive.

Figure 6 is a detail sectional view on line 6 6 of Figure 5.

Figures '7 and 8 are top plan and side elevational views, respectively,showing a modied gage construction.

Referring Iirst to Figures 1 to 3, 5 and 6, the gage comprises a supportI having means such as a post 2 extending upwardly therefrom forsupporting a work piece to be gaged at 3, As shown this support 2 isthreaded at 4 for engagement with internal threads on the work piece insuch a manner that the work piece may be rotated during the gagingaction. Where threaded engagement exists between the post and the workpiece it Will be noted that rotation of the work piece will beaccomplished by axial motion of the work with respect to the support I,but as will later more fully appear, this gage is also usable where thework-supporting post is unthreaded and supports internal Work forrotation unaccompanied by any axial motion thereof, or as will laterappear, it is applicable to a work piece having an external plane orthreaded shank portion about the axis of which it may be turned.

The rear face of the support I has attached thereto, as by screws 6, abracket l which has a pair of spaced oppositely disposed bearingportions 8 (see Fig. 6) which support cone kcenters 9 shown as threadedtherethrough and provided with lock nuts I by which they may be securedin adjusted positions. The inner cone ends Il of the centers 9 engage inmating bearing openings I4 in a cylindrical block I5, this block beingjournaled on the centers 9 eccentric to its axis. The block I is held inadjusted angular position within a cylindrical split bearing I'I at oneend of an arm I8. When the block I5 is adjusted to the desired angularposition, it may be clamped in such position by the clamp screw IISwhich closes the rsplit portions of the kcylindrical bearing I'I againstthe block I 5. The 'for- Ward end of the arm I8 carries a bearing pin I9having conical ends which find bearing in a iixed bearing plug 2 I atone end and in a threaded bearing plug 22 at the other end. These plugsare seated in side wall portions 23 and "24 of a second arm 25 whichextend at right angles to the arm I8. The bearing screw 22 may be adjusted to take up wear in the pivotal mounting of the arm 25 and may bexed in adjusted position as by a lock nut 26.

The arm 25 extends over the support I in normal position of the partsand at its forward end it carries a pair of relatively iixedwork-engaging anvils 28. As shown best in Figure 3, these anvils may bethreaded into blocks seated in ways 3| and they extend in inclinedrelation to each other such that their ends 29 may engage on the topface 32 of the work piece 3 substantially diametrically opposite to eachother with relation to the axis of the post 2 on which the work piece isrotatably carried.

The angular adjustment of the cylindrical block I5 provides for shiftingthe engagement of the relatively fixed anvils on the work piece to suchpositions that they engage the work piece face 32 substantiallyequidistant from the axis of rotation of the work piece and atsubstantially diametrically spaced points, a free pivotal mounting oi'the arm 25 permitting the fixed anvils to engage the work piece todetermine the angular position of this arm 25. The arm 25 also carries adial indicator provided with a stem 36 which carries a relativelymovable anvil 31. This anvil 3l as shown is arranged to engagethe face32 of the work piece substantially equidistant from the engagements ofthe relatively fixed anvils 28 thereon and substantially in a radius rfrom the axis of the Work piece o, angularly spaced substantially fromthe diameter :r-'J where the xed anvils engage the work face. While therelative positions of engagement between the iixed and movable anvils onthe work face may be varied, it is important that the axes of the pivotpin I9 and of the rotation of the work piece be substantiallyperpendicular to each other, and that the axis of the pin I9 intersectsa straight line joining the fixed anvil points 29. Under such conditionsthe axis of the pin I9 will lie in a plane determined by the points 29and the point of engagement on the work face of the movable anvil 31when there is no runout, and this plane will rock about the line joiningthe xed anvil points 29 away from the axis of the pin I9 and causecorresponding motion of the indicator pointer as the work is turnedabout its axis if runout of the Work face be present. By rotation of thework piece when the anvils are thus in engagement with the face 32, anyinaccuracy in this face with respect to the perpendicular to the workaxis will result in changes in position of the movable anvil which willbe reiiected in movements of the pointer 40 of the dial indicator.

In order that the anvils may bear against the Work face with the desiredamount of pressure, means may be provided for more or lesscounterbalancing the weight of the arms I8 and 25 and the parts carriedthereby. For example, the counteweight 4I may be carried by the splitclamp ring I1 and is positioned on the opposite side of the axis ofrotation of the arm I 8 about the centers 9 from the anvils and theindicator. The arm 25 also may be provided with a counterweight 42 (seeFigures l, 2 and 5) which is supported from a flange 43 depending fromthe arm 25 and on the other side of the axis of rotation of the arm 25from the parts carried by the arm 25, thus to tend to hold the movableanvil 31 in an upright position.

It will thus be seen that the dial indicator is responsive to relativemotion between the relatively movable and the stationary anvils all ofwhich engage the face of the work to be gaged. Thus this response of theindicator is independent of axial motions of the work piece while it isbeing turned about its axis so that even though the work piece isthreaded and must therefore move longitudinally of its axis while beingrotated, the action of the indicator is not affected thereby.

By suitable choice of the counterbalance weights the amount of pressureof the anvils upon the work piece face may be adjusted as desired. Forexample, as shown in Figure 4, the counterbalance 4l may be made tooverbalance the weight of the parts tending to press the gaging elementsdownwardly, so that they may be brought upwardly against the under face32a of the Work piece 3a. This work piece is shown as provided with anexternally threaded shank portion 45 which engages in an internallythreaded supporting element 46. It will thus be seen that the mechanismcan be made to operate upon work pieces having internal or externalthreads or cylindrical openings or shanks determining the axis ofrotation, and that the face to be gaged may be either an upper or underface depending upon the size of the counterweight used and thedispositions of the anvils. For example, as shown in Figure 4, therelatively xed anvils 46 have upwardly turned extremities 41 whichengage the face 32a substantially diametrically and on opposite sides ofthe threaded shank 45, while the movable anvil 48 has an up-turnedextremity 49 which engages the same face on a radius substantiallyperpendicular to the diameter at which the relatively i-lxed anvilportions 41 engage this i308,

4 Here, again, any vertical motion of the work piece which may takeplace during its rotation, as by its threaded mounting, is ineffectiveon the response of the dial indicator 35.

In place of employing this gage as a separate mechanism, it may beincorporated in an external or internal thread or cylindrical gage. Forexample, as shown in Figure 1, it is only necessary that the work piecebe supported by the diameterindicating means, such, for example, as therelatively xed anvil 5U and the relatively movable anvil 5|, the latterbeing carried by a pivoted arm 52, permitting the spacing of theseelements to be responsive to the work size. For example, these anvilsmay have points which engage within the threads of an internallythreaded work piece. The arm 52 may have an extension 53 terminating ina ringer portion 54 which may be pressed toward a iixed finger portion55 in order to open the gage so as to permit the insertion or removal ofthe work piece. A size indicating dial indicator 56 may engage with oneof the ringer portions 54, thus to show the extent of opening of thesize anvils when a work piece is supported thereon and a spring 51reacting between the movable element 53 and a xed portion 60 of the gageframe will act to press the anvils against the work piece with thedesired pressure for the size gaging action and to hold the work piecewith capability of being rotated aboutl its axis for the gaging actionof face run-out gaging elements 23 and 31. These run-out gage elements28 and 31 may be supported by the arms 25 and I8 which are mounted onthe gage base 65 in the same manner as previously described withreference to the support l.

From the foregoing description of certain embodiments of this inventionit will be evident to those skilled in the art that various changes andmodifications may be made without departing from its spirit or scope.

I claim:

1. A gage of the class described comprising a support having means forsupporting a work piece for rotation about an axis, a member carried bysaid support for motion generally lengthwise of said axis and having apair of spaced elements engageable at their ends with an end face of awork piece so supported, said member being rockably mounted on an axissubstantially intersecting a line joining said ends to permit said endsto automatically adjust to such engagement regardless of the angularrelation of said end face to said axis, and an indicator carried by saidmember and having a stem positioned for engagement on said end facespaced at one side of a line connecting said element ends.

2. A gage of the class described, comprising means for holding a workpiece to be gaged for turning about an axis, means for engaging an endface of said work piece transverse to said axis at a pair of spacedpositions, said engaging means being mounted for rocking motion about anaxis substantially intersecting a straight line connecting saidpositions, a movable gaging anvil engageable with said face at one sideof said line and mounted for motion in the direction of said rstmentioned axis relative to said engaging means, and means for indicatingvariations in the position of said gaging anvil With respect to saidline as said work piece is being rotated about said rst mentioned axis.

3. A gage of the class described, comprising means for holding a workpiece to be gaged for turning about an axis, means for engaging a faceof said work piece at a pair of positions substantially diametricallyopposed across said axis, a movable gaging anvil engageable with saidface at one side of a straight line connecting said positions andsubstantially equidistant from said positions, means for indicatingvariations in the position of said movable anvil as said work piece isbeing rotated about said axis, a pair of arms arranged perpendicular toeach other, means pivotally mounting one of said arms on the other ofsaid arms, means pivotally supporting the other of said arms on an axisparallel to the axis of said pivotal mounting of said one arm, said onearm carrying said face-engaging means, said gaging anvil and saidindicating means, and a counterweight carried by said one arm tending tohold said movable anvil vertically in all angular positions of the otherof said arms.

4. A gage of the class described, comprising a support, a cylindricalmember pivoted eccentrically to said support, an arm having a portionfor clamping engagement with said member and relative to which saidmember is angularly adjustable about its axis, a second arm freelypivoted to said rst-mentioned arm parallel to the pivotal axis of saidmember, means carried by said support for carrying a work piece to begaged rotatable about an axis perpendicular to said pivotal axes, a pairof relatively xed anvils carried by said second arm for engagement witha face of said Work piece at spaced points, a line connect- 3 ing saidpoints intersecting the axis of the pivotal connection of said secondarm to said rst mentioned arm, a movable anvil movably carried by saidsecond arm for engagement with said work piece face on a radius fromsaid work piece 35 axis substantially perpendicular to said line be- 5cally to said support, an arm having a portion for clamping engagement.with said member and relative to which said member is angularlyadjustable about its axis, a second arm freely pivoted to saidiirst-mentioned arm parallel to the 10 pivotal axis of said member,means carried by said Support for carrying a Work piece to be gagedrotatable about a substantially vertical axis, a pair of relativelyfixed anvils carried by said second arm for engagement with a face ofsaid 15 work piece at points disposed substantially diametrical to saidWork piece axis, a movable anvil movably carried by said second arm forengagement with said Work piece face on a radius from said work pieceaxis substantially perpendicular 20 to a straight line between saidpoints, an indicator carried by said second arm and responsive to theposition of said movable anvil, and means for counterweighting said armsto determine the pressure exerted on said work face by said anvils.

HESSLAR H. GATES.

References Cited in the file of this patent UNITED STATES PATENTS 0Number Name Date 2,224,728 Gulliksen Dec. 10, 1940 2,233,626 McClureMar. 4, 1941 2,309,891 Fisk Feb. 2, 1943 2,331,987 Leatherman Oct. 19,1943 2,427,152 Moore Sent. 9, 1947

